ISO 2340:1986

Overview

ISO 2340:1986 specifies the characteristics and designation of clevis pins without head (articulation pins) in metric sizes. It covers two types: Type A (solid pins without split-pin holes) and Type B (pins with split‑pin holes). The standard applies to nominal diameters from 3 mm up to and including 100 mm, giving dimensional series, material guidance, surface finishes and example designations for procurement and specification.

Key topics and requirements

• Scope and types: Defines Type A (no holes) and Type B (with holes for split pins).
• Dimensions and tolerances: Metric nominal diameters from 3 mm to 100 mm with specified length series and dimensional tolerances. Surface roughness values are specified for the relevant faces.
• Material and hardness: Typical material is free‑cutting steel (St) with a hardness range of 125–245 HV; other materials by agreement between supplier and customer.
• Surface finish: Preferred finishes include black oxide, phosphating, and zinc plating with chromate conversion. All dimensional tolerances apply before coating or plating.
• Quality and acceptance: Parts must be free of burrs and defects; reception and inspection follow ISO 3269.
• Designation rules: Standard gives clear example formats for specifying pins, e.g.:
  • Axe d’articulation ISO 2340 - B - 20 x 100 - St
  • Axe d’articulation ISO 2340 - B - 20 x 100 x 6,3 - St
  • Axe d’articulation ISO 2340 - B - 20 x 100 x 6,3 x 80 - St
• Railway note: For railway applications and where split pins are exposed to shear, the standard recommends using split pins and matching holes of the next larger diameter than specified (see ISO text).

Applications and who uses the standard

ISO 2340 is relevant to designers, procurement specialists, fastener manufacturers, quality engineers and maintenance teams involved with mechanical joints and articulating connections. Typical applications include:

• Mechanical linkages and hinges
• Agricultural and construction machinery
• Automotive and industrial equipment assemblies
• Railway fastenings (noting the specific recommendation for shear-critical split‑pin arrangements)

Using ISO 2340 helps ensure interchangeability, proper fit with split pins (see ISO 1234) and consistent quality across suppliers.

Related standards

• ISO 1234 - Split pins (metric series) - relates split‑pin diameters to clevis pin holes
• ISO 2081 - Metallic coatings - zinc plating
• ISO 4520 - Chromate conversion layers on zinc/cadmium deposits
• ISO 3269 - Fasteners - inspection/acceptance procedures

Keywords: ISO 2340:1986, clevis pins without head, clevis pin dimensions, split pin holes, metric clevis pins, fastener specifications, designation examples.